http://netty.io/netty-all/: Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers and clients. (The Netty Project) 
public class io.netty.buffer.ByteBufOutputStream extends java.io.OutputStream implements java.io.DataOutput
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.netty.buffer.ByteBufOutputStream
  super_class: java.io.OutputStream
{
  private final io.netty.buffer.ByteBuf buffer;
    descriptor: Lio/netty/buffer/ByteBuf;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final int startIndex;
    descriptor: I
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.io.DataOutputStream utf8out;
    descriptor: Ljava/io/DataOutputStream;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>(io.netty.buffer.ByteBuf);
    descriptor: (Lio/netty/buffer/ByteBuf;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // io.netty.buffer.ByteBuf buffer
         0: .line 47
            aload 0 /* this */
            invokespecial java.io.OutputStream.<init>:()V
         1: .line 42
            aload 0 /* this */
            new java.io.DataOutputStream
            dup
            aload 0 /* this */
            invokespecial java.io.DataOutputStream.<init>:(Ljava/io/OutputStream;)V
            putfield io.netty.buffer.ByteBufOutputStream.utf8out:Ljava/io/DataOutputStream;
         2: .line 48
            aload 1 /* buffer */
            ifnonnull 4
         3: .line 49
            new java.lang.NullPointerException
            dup
            ldc "buffer"
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         4: .line 51
      StackMap locals: io.netty.buffer.ByteBufOutputStream io.netty.buffer.ByteBuf
      StackMap stack:
            aload 0 /* this */
            aload 1 /* buffer */
            putfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
         5: .line 52
            aload 0 /* this */
            aload 1 /* buffer */
            invokevirtual io.netty.buffer.ByteBuf.writerIndex:()I
            putfield io.netty.buffer.ByteBufOutputStream.startIndex:I
         6: .line 53
            return
        end local 1 // io.netty.buffer.ByteBuf buffer
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    7     0    this  Lio/netty/buffer/ByteBufOutputStream;
            0    7     1  buffer  Lio/netty/buffer/ByteBuf;
    MethodParameters:
        Name  Flags
      buffer  

  public int writtenBytes();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // io.netty.buffer.ByteBufOutputStream this
         0: .line 59
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            invokevirtual io.netty.buffer.ByteBuf.writerIndex:()I
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.startIndex:I
            isub
            ireturn
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/buffer/ByteBufOutputStream;

  public void write(byte[], int, int);
    descriptor: ([BII)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=4, args_size=4
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // byte[] b
        start local 2 // int off
        start local 3 // int len
         0: .line 64
            iload 3 /* len */
            ifne 2
         1: .line 65
            return
         2: .line 68
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            aload 1 /* b */
            iload 2 /* off */
            iload 3 /* len */
            invokevirtual io.netty.buffer.ByteBuf.writeBytes:([BII)Lio/netty/buffer/ByteBuf;
            pop
         3: .line 69
            return
        end local 3 // int len
        end local 2 // int off
        end local 1 // byte[] b
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    4     1     b  [B
            0    4     2   off  I
            0    4     3   len  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      b     
      off   
      len   

  public void write(byte[]);
    descriptor: ([B)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // byte[] b
         0: .line 73
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            aload 1 /* b */
            invokevirtual io.netty.buffer.ByteBuf.writeBytes:([B)Lio/netty/buffer/ByteBuf;
            pop
         1: .line 74
            return
        end local 1 // byte[] b
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    2     1     b  [B
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      b     

  public void write(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // int b
         0: .line 78
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            iload 1 /* b */
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
         1: .line 79
            return
        end local 1 // int b
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    2     1     b  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      b     

  public void writeBoolean(boolean);
    descriptor: (Z)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // boolean v
         0: .line 83
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            iload 1 /* v */
            invokevirtual io.netty.buffer.ByteBuf.writeBoolean:(Z)Lio/netty/buffer/ByteBuf;
            pop
         1: .line 84
            return
        end local 1 // boolean v
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    2     1     v  Z
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      v     

  public void writeByte(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // int v
         0: .line 88
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            iload 1 /* v */
            invokevirtual io.netty.buffer.ByteBuf.writeByte:(I)Lio/netty/buffer/ByteBuf;
            pop
         1: .line 89
            return
        end local 1 // int v
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    2     1     v  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      v     

  public void writeBytes(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // java.lang.String s
         0: .line 93
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            aload 1 /* s */
            getstatic io.netty.util.CharsetUtil.US_ASCII:Ljava/nio/charset/Charset;
            invokevirtual io.netty.buffer.ByteBuf.writeCharSequence:(Ljava/lang/CharSequence;Ljava/nio/charset/Charset;)I
            pop
         1: .line 94
            return
        end local 1 // java.lang.String s
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    2     1     s  Ljava/lang/String;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      s     

  public void writeChar(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // int v
         0: .line 98
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            iload 1 /* v */
            invokevirtual io.netty.buffer.ByteBuf.writeChar:(I)Lio/netty/buffer/ByteBuf;
            pop
         1: .line 99
            return
        end local 1 // int v
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    2     1     v  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      v     

  public void writeChars(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // java.lang.String s
         0: .line 103
            aload 1 /* s */
            invokevirtual java.lang.String.length:()I
            istore 2 /* len */
        start local 2 // int len
         1: .line 104
            iconst_0
            istore 3 /* i */
        start local 3 // int i
         2: goto 5
         3: .line 105
      StackMap locals: int int
      StackMap stack:
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            aload 1 /* s */
            iload 3 /* i */
            invokevirtual java.lang.String.charAt:(I)C
            invokevirtual io.netty.buffer.ByteBuf.writeChar:(I)Lio/netty/buffer/ByteBuf;
            pop
         4: .line 104
            iinc 3 /* i */ 1
      StackMap locals:
      StackMap stack:
         5: iload 3 /* i */
            iload 2 /* len */
            if_icmplt 3
        end local 3 // int i
         6: .line 107
            return
        end local 2 // int len
        end local 1 // java.lang.String s
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    7     1     s  Ljava/lang/String;
            1    7     2   len  I
            2    6     3     i  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      s     

  public void writeDouble(double);
    descriptor: (D)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // double v
         0: .line 111
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            dload 1 /* v */
            invokevirtual io.netty.buffer.ByteBuf.writeDouble:(D)Lio/netty/buffer/ByteBuf;
            pop
         1: .line 112
            return
        end local 1 // double v
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    2     1     v  D
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      v     

  public void writeFloat(float);
    descriptor: (F)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // float v
         0: .line 116
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            fload 1 /* v */
            invokevirtual io.netty.buffer.ByteBuf.writeFloat:(F)Lio/netty/buffer/ByteBuf;
            pop
         1: .line 117
            return
        end local 1 // float v
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    2     1     v  F
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      v     

  public void writeInt(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // int v
         0: .line 121
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            iload 1 /* v */
            invokevirtual io.netty.buffer.ByteBuf.writeInt:(I)Lio/netty/buffer/ByteBuf;
            pop
         1: .line 122
            return
        end local 1 // int v
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    2     1     v  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      v     

  public void writeLong(long);
    descriptor: (J)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // long v
         0: .line 126
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            lload 1 /* v */
            invokevirtual io.netty.buffer.ByteBuf.writeLong:(J)Lio/netty/buffer/ByteBuf;
            pop
         1: .line 127
            return
        end local 1 // long v
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    2     1     v  J
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      v     

  public void writeShort(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // int v
         0: .line 131
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            iload 1 /* v */
            i2s
            invokevirtual io.netty.buffer.ByteBuf.writeShort:(I)Lio/netty/buffer/ByteBuf;
            pop
         1: .line 132
            return
        end local 1 // int v
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    2     1     v  I
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      v     

  public void writeUTF(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.netty.buffer.ByteBufOutputStream this
        start local 1 // java.lang.String s
         0: .line 136
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.utf8out:Ljava/io/DataOutputStream;
            aload 1 /* s */
            invokevirtual java.io.DataOutputStream.writeUTF:(Ljava/lang/String;)V
         1: .line 137
            return
        end local 1 // java.lang.String s
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/netty/buffer/ByteBufOutputStream;
            0    2     1     s  Ljava/lang/String;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      s     

  public io.netty.buffer.ByteBuf buffer();
    descriptor: ()Lio/netty/buffer/ByteBuf;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.buffer.ByteBufOutputStream this
         0: .line 143
            aload 0 /* this */
            getfield io.netty.buffer.ByteBufOutputStream.buffer:Lio/netty/buffer/ByteBuf;
            areturn
        end local 0 // io.netty.buffer.ByteBufOutputStream this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/buffer/ByteBufOutputStream;
}
SourceFile: "ByteBufOutputStream.java"